HEAVY DUTY - OUTDOOR RESEARCH DURABLE DRY SACK. Nothing is too much for the Outdoor Research Durable Dry Sack. Made of 210D nylon with a PU coating and fully taped seams, you could throw this sack in the river if you really wanted to test its waterproof abilities. FEATURESFully seam-tapedDurable PU coated nylonRoll-top closureExternal daisy chainWebbing handleD-ringTECH SPECS210D nylon, PU coating material